Effects of thickness on the cation segregation in epitaxial (001) and (110) La2/3Ca1/3MnO3 thin films

Electron-energy-loss spectroscopy is used to map composition and electronic states in epitaxial La2/3Ca1/3MnO3 LCMO films of various thicknesses grown on SrTiO3 001 and 110 substrates. For relatively thick films 20 nm , epitaxial tensile strain in 001 films promotes a compositional La/Ca gradient ac...

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Detalles Bibliográficos
Autores: Estradé Albiol, Sònia, Rebled, J. M. (José Manuel), Arbiol i Cobos, Jordi, Peiró Martínez, Francisca, Infante, I. C., Herranz Casabona, Gervasi, Sánchez, F., Fontcuberta i Griñó, Josep, Córdoba, R., Mendis, B. G., Bleloch, A. L.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/32768
Acceso en línea:https://hdl.handle.net/2445/32768
Access Level:acceso abierto
Palabra clave:Cations
Pel·lícules fines
Espintrònica
Espectroscòpia de pèrdua d'energia d'electrons
Thin films
Spintronics
Electron energy loss spectroscopy
Descripción
Sumario:Electron-energy-loss spectroscopy is used to map composition and electronic states in epitaxial La2/3Ca1/3MnO3 LCMO films of various thicknesses grown on SrTiO3 001 and 110 substrates. For relatively thick films 20 nm , epitaxial tensile strain in 001 films promotes a compositional La/Ca gradient across the film thickness, being the interface La rich, while the relaxed 110 films are chemically homogeneous. In contrast, much thinner 001 and 110 LCMO films display a different La/Ca distribution, being La rich at the free surface. The observed distinct thickness-dependent composition gradient behavior reflects a balance between strain-induced elastic energy minimization and kinetic effects during growth.

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